Check whether this combination of clusters correspond to a decaying particle or not: More than 50% of clusters, including 1 before and 1 after the dipole, must be connected.

Return the MC label of the most downstream decay product or -1 if not a decay.

"isReconstructible" tells if the combination of matched clusters fulfil the reconstruction criteria.

As soon as we realized the decay chain cannot be tagged as reconstructible, we reject any chain ending on a chamber equal to or upstream "lastCh" (used to select the best chain in case of multiple choices).

"lastCh" is reset the most downstream chamber of the found decay chain if any.

loop over reconstructible TrackRef not associated with reconstructed track: for each of them, find and remove the most connected the fake track, if any, and fill the histograms with the fraction of connected clusters. Return the number of reconstructible track not connected to any fake